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Manuscripts and Archives Division, The New York Public Library. "Letter from A. Carnegie to Dr. J.S. Billings, 12th March 1901" The New York Public Library Digital Collections. 1901. https://digitalcollections.nypl.org/items/8f4d2673-7956-28c1-e040-e00a18061ade
Manuscripts and Archives Division, The New York Public Library. "Letter from A. Carnegie to Dr. J.S. Billings, 12th March 1901" New York Public Library Digital Collections. Accessed February 11, 2025. https://digitalcollections.nypl.org/items/8f4d2673-7956-28c1-e040-e00a18061ade
Manuscripts and Archives Division, The New York Public Library. (1901). Letter from A. Carnegie to Dr. J.S. Billings, 12th March 1901 Retrieved from https://digitalcollections.nypl.org/items/8f4d2673-7956-28c1-e040-e00a18061ade
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(text)
Letter from A. Carnegie to Dr. J.S. Billings, 12th March 1901, (1901)|author=Digital Collections, The New York Public Library |accessdate=February 11, 2025 |publisher=The New York Public Library, Astor, Lenox, and Tilden Foundations}}</ref>